Deciding between a gas vs. electric water heater is a critical decision for any homeowner. The right choice impacts your home's long-term energy efficiency, upfront installation costs, and monthly utility bills for a decade or more. Both technologies have matured significantly, and the right answer depends on your home's existing infrastructure, local energy costs, household size, and long-term efficiency goals. This gas vs. electric water heater comparison breaks down the critical differences between conventional gas, Rheem Professional Classic Plus Electric Water Heater, and electric heat pump (hybrid) models so you can make a confident, informed choice before calling a plumber. (If you are considering a smaller electric unit, see our A.O. Smith EES-40 review). (If you're also upgrading your basement drainage, check our Ridgid SP-650C sump pump guide for the best protection). Whether you need the rapid recovery of an A.O. Smith Power Vent Natural Gas Water Heater or the extreme efficiency of a Bradford White AeroTherm 50-Gallon Hybrid Heat Pump Water Heater, this guide clarifies the trade-offs to help you choose the best water heater for your home.
For those seeking endless hot water, the Navien Condensing Tankless Water Heater is a top-tier high-efficiency alternative.
We'll also briefly touch on how the Navien compares in the FAQ at the end.
Looking for a high-performance upgrade? Explore the A.O. Smith 50-Gallon Power Vent Natural Gas Water Heater for faster recovery.
Quick Picks: TL;DR
- Best for most homes with a gas line: Gas water heater — faster recovery, lower operating costs in most U.S. markets.
- Best for all-electric homes or tight spaces: A.O. Smith 40-Gallon Tall Electric Water Heater (read our detailed A.O. Smith EES-40 review) — lower upfront cost, easy installation, no venting required. (For DIY connection tips, see our SharkBite coupling guide).
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Best for maximum long-term savings: Rheem ProTerra 50-Gallon Hybrid Electric Water Heater — 2–4× more efficient than a Rheem Professional Classic Plus Electric Water Heater, qualifies for
federal tax credits.
Related parts & accessories
1. Gas Water Heater
A conventional gas water heater uses a burner fueled by natural gas or liquid propane (LP) to heat water stored in an insulated tank, typically ranging from 30 to 80 gallons. Because combustion delivers heat rapidly, gas models recover quickly after a heavy draw — a 50-gallon unit can reheat a full tank in roughly 30–40 minutes, compared to 60–80 minutes for a comparable electric resistance model.
Who it's for: Households already connected to a natural gas line, larger families with high simultaneous hot-water demand, and homeowners looking to minimize operating costs in areas where natural gas is priced well below electricity on a per-BTU basis. For a professional-grade solution, consider the A.O. Smith 50-Gallon Power Vent Natural Gas Water Heater or the Rheem Professional Classic Plus 50-Gallon Direct Vent Natural Gas Water Heater.
Installation requirements
Gas water heaters require a dedicated gas supply line, a cold-water inlet, a hot-water outlet, a temperature-pressure relief (TPR) valve, and — critically — a flue or venting system to expel combustion byproducts outdoors. Traditional atmospheric-vent models use a vertical exhaust flue; power-vent models use a blower to push exhaust through a horizontal PVC pipe, offering more flexible placement. Direct-vent models pull combustion air from outside, making them suitable for tight or unventilated utility rooms.
Energy factor and operating costs
Modern gas water heaters carry a Uniform Energy Factor (UEF) of roughly 0.60–0.70 for standard atmospheric-vent models and up to 0.80–0.86 for high-efficiency condensing units. At average U.S. natural gas prices, a typical family of four spends approximately $200–$350 per year to heat water with gas, depending on local rates and usage patterns.
Safety and maintenance
Gas appliances introduce combustion risks — carbon monoxide, gas leaks, and improper draft — that electric units simply don't carry. Annual inspection of the burner, thermocouple, and venting is strongly recommended. Anode rod replacement every 4–6 years prolongs tank life regardless of fuel type. To further protect your plumbing and water quality, consider adding a GE GXWH40L whole-house water filter to prevent sediment buildup and protect your tank from mineral buildup—consider a Culligan WH-HD200-C whole-house filtration system—especially when using a high-efficiency unit like the Rheem Professional Classic Plus 50-Gallon Direct Vent Natural Gas Water Heater. If you're updating other fixtures, our modern bath fixture guide offers great options for modern bathrooms.
Pros
- Faster first-hour delivery and tank recovery
- Lower operating costs in most U.S. gas markets
- Older standing-pilot models continue to function during power outages
- Wide range of sizes and venting configurations
- Lower upfront cost than heat pump electric models
Cons
- Requires an existing gas line (costly to add)
- Mandatory venting increases installation complexity and cost
- Combustion safety risks require ongoing maintenance
- Standby heat loss through the flue reduces overall efficiency
- Not viable for all-electric homes or apartments
- Most modern gas units use electronic ignition and won't operate during power outages
